Can someone describe to me what is good about OCaml? Unfortunately I think I've only eve heard complaints about it, many being mentioned here (multicore support

Can someone describe to me what is good about OCaml? Unfortunately I think I've only eve heard complaints about it, many being mentioned here (multicore support, bad tooling, things like utf support you'd expect to be built in, Windows pains, etc.). I've also read a number of admittedly older peices criticizing it's type system among other things. When or why should someone consider using OCaml versus a lisp, modern mainstream languahes or even a purely functional language like Haskell?